Unfortunately, in spite that “circulares structures” are more resistant to the square, the loss of stability between the triangular pieces, make impractical such constructions, facing the square, that can make " real physics and logic attacks: while this loss of stability between triangular pieces, eventually finds problematic already not only this type of construction, but even epic when someone tries to make a roof with these parts.
Perhaps, one way would be that the triangular pieces, lost 10 of stability rather than 20 when they move from piece to piece, so, for a same surface, at the end lost the same 20 to the square pieces.
And please create some type of pieces to fill between pieces, or fill buildings that remain at medium altitude from general walls as the vault.
Thanks.